Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Carved, egg-shaped stone with no explanation.

100 massive sculptures in the Hudson River Valley.

The place where the great marine explorer first learned to work underwater is not where you'd expect.

The world’s largest underground marble quarry is hiding in Vermont.

This tiny patch of arid sand sits in one of the greenest states in the United States.

World's largest herd of white deer populate a former U.S. Army depot.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

Train tunnel running underneath Quebec City.

This indiscriminate collection of audio antiques is trying to preserve the history of the audio industry one vintage appliance at a time.

This hidden park hosts a rogue’s gallery of eccentric architectural obelisks.

The vaulted ceiling is home to a scurry of “squirrelgoyles.”

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

No one messes with the Massachusetts sacred cod, not this time...